A detailed parametric thermodynamic cycle analysis is presented for various gt. Jan 11, 2017 introduction to gas power cycles video lecture of gas power cycles chapter from thermodynamics subject for mechanical engineering students. Lecture 11 combining chemical and thermal processes 1. Gas power cycles deal with systems that produce power in which the working fluid remains a gas throughout the cycle in other words, there is no change in phase. Nptel video course aerospace engineering jet aircraft propulsion. Gas power cycle the devices or systems used to produce a net power output are often called engines, and the thermodynamic cycles they operate on are called power cycles. The use of gas turbines for power generation has increased in recent years and is likely to continue to increase in the medium term. Introducing the latest combined cycle power plant with g. Therefore, the cycles are broadly classified as follows. The accurate analysis of the various processes taking place in an internal combustion engine is a very complex problem.
Mhi, and the thermal efficiency of the plant is the highest in the world. Chapter 8 gas power cycles 8 833 an ideal otto cycle with air as the working fluid has a compression ratio of 8. The temperature at the end of the isentropic expansion process is 800 k. An important application of thermodynamics is the analysis of power cycles through which the energy absorbed as heat can be. Effect of compression ratio on performance of combined cycle. The main difficulties of the carnot cycle are overcome by complete condensation in the condenser and by superheating optional. This paper describes and compares several power generation cycles which have been developed to take advantage of the gas turbines thermodynamic characteristics. These are a set of class notes for a gas dynamicsviscous.
Associate at iit khargpur for nearly one years before joining iit guwahati. If these processes were to be analyzed experimentally, the analysis would be very realistic no doubt. Manjulata pal engineering thermodynamics submitted by. Steam and gas power systems about the course this course provides a simple understanding of the steam and gas power systems. Gas refrigeration can also be used as precoolant for liquefiers and. A combined cycle power plant is an assembly of heat engines that work in tandem from the same source of heat, converting it into mechanical energy. Solve problems based on the otto, diesel, stirling.
Gas power cycle powerpoint presentations mechanical. Pdf study of combined cycle gas turbine power plantan overview. Additionally, the increasing use of wind and solar power imply major changes for combined cycle plant. Gas power cycles as can be seen from its name, an internal combustion engine is a heat engine in which heat is added to the working medium by fuel combustion inside the engine. The nature of the working fluids can be classified into two groups. The most efficient commercial technology for central station poweronly generation is the gas turbinesteam turbine combinedcycle plant, with efficiencies approaching 60 percent lower heating value lhv. Of power cycles modeling is a powerful engineering tool that provides great insight and simplicity at the expense of some loss in accuracy.
Engines lecture of gas power cycles chapter from thermodynamics subject for mechanical engineering students. Oct 05, 20 used in a power station because a the working fluid always remains in the gaseous phase and. If you have an account, sign in now to post with your account. Four different types of gas power cycles are commonly used. If you have any questions or find out some errors in my blogs, send me the email to the following address,i am very glad to receive your email and willing to help you. A thermodynamic cycle is a sequence or series of processes performed on a system, that eventually returns the system to its original state.
A compressor is a device, which pressurizes a working fluid. Otto cycle diesel cycle the topic menu above allows you to move directly to any of the four sections for each topic. The major components that make up a combined cycle are compressor, gas turbine, hrsg, and steam turbine as shown in fig. The student will type numerical parameters and excel will perform the calculations. Lecture 17 gas and vapour power cycles, otto cycle, diesel cycle, dual cycle. The course builds upon foundations laid in an earlier course where the emphasis was on subsonic ideal. However, the ideal closed vapor power cycle and ideal open gas cycles look remarkably similar. Gas turbines, cycles, performance, combined cycles contents 1. Chapter 9 gas power cycles universiti tenaga nasional. Severe exposures require air contents of 6 to 7 percent in freshly mixed concrete made with 3 4inch 19 mm or 1inch 25mm aggregate.
The project on development of remaining three quadrants to nptel phasei under grant in aid nmeict, mhrd, new delhi. The steam cycle is a practical one, it is the basis of virtually all steam power plants and hence electricity generation. This paper provides the historical evolution of the gas turbine gt based power cycles. The pressure and temperature at the end of the heat addition process, the net work output, the thermal efficiency, and the mean effective pressure for the cycle are to be determined. It would also be quite accurate if the tests are carried out. A cycle that resembles the actual cycle closely but is made up totally of internally reversible processes. Concrete exposed to freezing and thawing cycles must be airentrained. The basic principle of the combined cycle is simple. Prior to the isentropic compression process, the air is at 100 kpa, 35c, and 600 cm3. Develop simplifying assumptions applicable to gas power cycles. Chapter 9 gas power cycles actual and ideal cycles, carnot cycle, airstandard assumptions 91c the carnot cycle is not suitable as an ideal cycle for all power producing devices because it cannot be approximated using the hardware of actual power producing devices. Jun 25, 2016 perform secondlaw analysis of gas power cycles.
Ppt chapter 8 gas power cycle powerpoint presentation. Gas turbines can be used in poweronly generation or in combined heat and power chp systems. A gas power cycle may consist of heat transfer, work transfer, pressure variations, temperature variations, volume variations and entropy variations. The plant uses the latest g type gas turbines of mitsubishi heavy industries, ltd. Pdf study of combined cycle gas turbine power plantan. Other part of the course hasemphasis on thermodynamic cycle of aircraft engines. Using specific heat values at room temperature, determine a the highest. Spark ignition gasoline engines, compression ignition diesel engines and conventional gas turbine engines generally refer to as internal combustion engines or ic engines are. Mar 01, 2017 gas power cycle the devices or systems used to produce a net power output are often called engines, and the thermodynamic cycles they operate on are called power cycles. Gas power cycles free download as powerpoint presentation. In these engines at the first stage, the working medium is air or a mixture of air and an easily inflammable fuel, and at the second stage, the products of combustion of. Gas power cycles actual and ideal cycles, carnot cycle, airstandard assumptions 91c the carnot cycle is not suitable as an ideal cycle for all power producing devices because it cannot be approximated using the hardware of actual power producing devices.
Gas power cycles are thermodynamic cycles, which use air, as the working fluid. In the beginning of this diploma thesis the thermodynamic cycle of a gas turbine, its parameters and improvement possibility are presented. Pdf power plant lecture notes chapter6 gas turbines. M d atrey, department of mechanical engineering, iit bombay. Solve problems based on the otto, diesel, stirling, and. What are the assumptions made for air standard cycle analysis 5. Depending on the compression ratio of the gas turbine, the turbine exhaust temperature may be high enough to permit efficient generation of steam using the. Effect of compression ratio on performance of combined. Evaluate the performance of gas power cycles for which the working fluid remains a gas throughout the entire cycle. The generating companies are no longer running the combined cycle plants or investing in new plants for base load purposes. In the end it results in higher thermal efficiency, which is said to reach 46%. Burning gas in a gas turbine produces not only power which can be converted to electric power by a coupled generator but also fairly hot exhaust.
Me51 thermal engineering unit i gas power cycles parta 2 marks 1. The mass flow rate of air for a specified power output is to be determined. The course contains the analysis of vapour power cycle i. In moderate exposures, where deicing salts will not be used, 4 to 6 percent air will be sufficient. Increases the peak high compression ratio has been proposed to improve the combinedcycle gas turbine performance. The ilijan plant is an advanced combined cycle power plant, the largest in the philippines, with a rated capacity of 1,251 mw. On land, when used to make electricity the most common type is called a combined cycle gas turbine ccgt plant. Gas power cycles chapter 9 937 the compression ratio of an airstandard otto cycle is 9. In addition to the steamcooled combustor system, unique.
Compression ratio is the ratio between total cylinder volume to clearance volume. The code of the performance model for ccgt power plant was developed utilizing the matlab software. Mechanical engineering applied thermodynamics nptel. Introduction to gas power cycles video lecture of gas power cycles chapter from thermodynamics subject for mechanical engineering students. This 10 pdh professional development hour course includes a series of input data and solved output equations in an excel format. Thermodynamic cycles can also be categorized as gas cycles and vapour cycles, depending on the phase of the working fluid. Rankine cycle, steam generators and their accessories, performance of boilers and combuston of fuel, high pressure boilers, fow through steam and gas nozzles.
Solve problems based on the otto, diesel, stirling, and ericsson cycles. In a gas power cycle, the source of heat supply and the sink for heat rejection are considered to be external to the working fluid. Thermodynamic cycle is defined as the series of processes performed on the system, so that the system attains to its original state. Increases the peak high compression ratio has been proposed to improve the combinedcycle gasturbine performance. Power cycles otto cycle spark ignition diesel cycle brayton cycle gas turbine rankinecycle. Introduction to gas power cycles thermal engineering add comments. Combined cycles gas turbines ccgt are a lot used to acquire a efficiency power plant.
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